JPWO2019026903A1 - 短期間造腫瘍性スクリーニングシステム - Google Patents
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Abstract
Description
また、各種癌細胞の悪性度の評価や、抗がん剤の効果判定などにおいても、造腫瘍性は評価項目の一つである。
[1]実験動物の前眼房内に被検細胞を移植し、腫瘍形成の有無を観察することを特徴とする、該細胞の造腫瘍性の評価方法。
[2]観察期間が4〜8週間である、[1]記載の方法。
[3]移植細胞数が105細胞以上である、[1]又は[2]記載の方法。
[4]移植細胞数が105細胞〜107細胞である、[3]記載の方法。
[5]実験動物が免疫不全動物である、[1]〜[4]のいずれかに記載の方法。
[6]実験動物がラットである、[1]〜[5]のいずれかに記載の方法。
[7]被検細胞が幹細胞又はそこから分化誘導された体細胞である、[1]〜[6]のいずれかに記載の方法。
[8]被検細胞ががん細胞である、[1]〜[6]のいずれかに記載の方法。
[9]実験動物に、試験化合物をさらに投与し、腫瘍形成を指標として該化合物の抗腫瘍活性を評価することを特徴とする、[8]記載の方法。
あるいは、別の一実施態様においては、本発明の評価方法はがんの悪性度の評価や、抗がん薬のスクリーニング系として用いられるので、各種がん細胞(例、生検等にて患者から採取したがん細胞、がん細胞株等)もまた、被検細胞として使用可能である。
また、一定期間経過後に眼球を摘出して、組織染色(例、HE染色、組織特異的マーカーによる免疫染色)等により奇形腫を含む腫瘍形成を確認することもできる。
従って、本発明の評価方法においては、経過観察の期間は、好ましくは4〜8週間である。
実験動物として、免疫不全ラットF344/NJcl-rnu/rnu(5週令、日本クレア)を使用した。ドミトール (塩酸メデトミジン) 75 μg/ml、ドルミカム (ミタゾラム) 0.4 mg/ml、ベトルファール (酒石酸ブトルファノール) 0.5 mg/ml の3種混合麻酔液を、500 μl/100 gで腹腔内注射し、全身麻酔した。また、ベノキシール(0.4%, オキシブプロカイン塩酸塩点眼液)点眼により局所麻酔を行った。ヒトiPS細胞株201B7(http://cell.brc.riken.jp/ja/hps/hps0063_info)又はFFI-01(http://www.cira.kyoto-u.ac.jp/ ciRA 京都大学 iPS細胞研究所) 1x10^4細胞〜1×10^7 細胞を含む細胞懸濁液5 μlと、Matrigel 5 μlとを混合した液を、実体顕微鏡下に安置したラット(各群5匹)の片眼に注入した。抗菌剤として、クラビット点眼液(0.5%、レボフロキサシン水和物)を点眼した。移植後、一定期間(直後〜数か月)の経過観察を行い、その後より詳細な解析を行うため、ペントバルビタールを腹腔内に過量投与 (120mg/kg) することによりラットを安楽死させ、眼球を回収し、HE染色等を行って、奇形腫形成(三胚葉系列への分化)を確認した。本試験のプロトコルを図1に示す。
前房内容積の1/4以上を占める腫瘍形成をもって死亡と判定し、Kaplan-Meier生存曲線を作成した。201B7株の場合、1×10^6 細胞を移植すると、移植後4週目で5匹すべてのラットで死亡(奇形腫形成能あり)と判定された(図2左上)。HE染色の結果、三胚葉系列への分化が確認された(図2右)。1×10^5 細胞を移植した場合でも、8週間以内に60%(3/5匹)が死亡と判定された(図2左下)。FFI-01株を移植した場合も、同様の結果が得られた(図3)。尚、1×10^7 細胞を移植した場合は、いずれのiPS細胞株でも、移植後4週目にすべてのラットが死亡と判定された。一方、1×10^4 細胞を移植した場合には、いずれの細胞株でも腫瘍形成を認めなかった。
Claims (9)
- 実験動物の前眼房内に被検細胞を移植し、腫瘍形成の有無を観察することを特徴とする、該細胞の造腫瘍性の評価方法。
- 観察期間が4〜8週間である、請求項1記載の方法。
- 移植細胞数が105細胞以上である、請求項1又は2記載の方法。
- 移植細胞数が105細胞〜107細胞である、請求項3記載の方法。
- 実験動物が免疫不全動物である、請求項1〜4のいずれか一項に記載の方法。
- 実験動物がラットである、請求項1〜5のいずれか一項に記載の方法。
- 被検細胞が幹細胞又はそこから分化誘導された体細胞である、請求項1〜6のいずれか一項に記載の方法。
- 被検細胞ががん細胞である、請求項1〜6のいずれか一項に記載の方法。
- 実験動物に、試験化合物をさらに投与し、腫瘍形成を指標として該化合物の抗腫瘍活性を評価することを特徴とする、請求項8記載の方法。
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Non-Patent Citations (5)
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